/Engine/Source/Developer/CollectionManager/Public/ICollectionManager.h
Adds a collection to the asset registry. A .collection file will be added to disk.
true if the add was successful. If false, GetLastError will return a human readable string description of the error.
bool CreateCollection ( [FName](API\Runtime\Core\UObject\FName) CollectionName, [ECollectionShareType::Type](API\Developer\CollectionManager\ECollectionShareType\Type) ShareType, [ECollectionStorageMode::Type](API\Developer\CollectionManager\ECollectionStorageMode\Type) StorageMode )